| http://www.w3.org/ns/prov#value | - These and other objects are accomplished, in accordance with the illustrated embodiment of the invention, by a device of the type described in which the central body has means thereon providing an upwardly facing, downwardly and outwardly conically shaped seating surface, and a collet surrounding the body above the seating surface and including a ring at its upper end vertically slidable along the
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